mkdir build-android
cd build-android
#cmake ..
cmake  -DCMAKE_TOOLCHAIN_FILE=${ANDROID_NDK}/build/cmake/android.toolchain.cmake -DCMAKE_BUILD_TYPE=Release -DANDROID_ABI=arm64-v8a -DANDROID_TOOLCHAIN=clang -DANDROID_STL=c++_static ..
make -j3
